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How much energy is required to decompose 5 mol of N 2 O 3 ?ģ2 kJ + 2 N 2 O 3(g) -> 2 N 2(g) + 3 O 2(g) PRACTICE PROBLEMS : Calculate the energy or moles as needed. VIDEO Stoichiometry with Energy Conversions Demonstrated Example 2 : How many moles of Ca are created when 1400 kJ is released?Ħ Ag (s) + Ca 3 (PO 4 ) 2(s) -> 3 Ca (s) + 2 Ag 3 PO 4(s) Δ H = -382 kJ/molĪnswer: units first, set up the units that need to cancel out (in red ) 1400 kJĪnswer: Fill in the numbers and cross out units 1400 kJ What information does the question supply us with?Īnswer: units first, set up the units that need to cancel out (in red ) 4 mol MnI 3Īnswer: Fill in the numbers and cross out units 4 mol MnI 3 VIDEO Stoichiometry with Energy Conversions Demonstrated Example 1 : How much energy is required to decompose 4 mol of MnI 3 ?
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Notice the negative symbol of the energy does not appear anywhere in the ratios. What is the ratio of CO 2 to the energy? 8 CO 2 What is the ratio of O 2 to the energy? 13 O 2 The second most common way to see an equation with energy is like below.Ģ C 4 H 10(l) + 13 O 2(g) -> 8 CO 2(g) + 10 H 2 O (g) Δ H = -368 kJ/mol What is the ratio of NH 3 to the energy? 200 kJ What is the ratio of N 2 to the energy? 1 N 2 This equation allows us to write ratios to the energy like: The first most common way to see an equation with energy is like below.
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Then we can show how to write parts of that equation in a ratio. To start we should look at a couple of different ways a chemical equation can be presented with energy. If not go back and review those previous sections especially…… Stoichiometry with energy is simply using the different energy notations like you would a mole to mole ratio. You will probably want to have a strong foundation in the previous sections of…….before you learn about this section. HOW DO YOU USE STOICHIOMETRY WITH ENERGY?